The "DUO" is equipped with a USB-C plug and the stereo version has a USB-A plug. With stereo, the headsets have speakers on the left and right. So if you also want to use the headset for music, I would recommend a stereo. It is also a question of which variant is more comfortable for you. "MS" and "UC" differ in certification. MS stands for Microsoft certification and is therefore optimised for Office/Teams and Skype products. The question here is with which software you will use the headset.